Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.<br>A:only when fully loaded<br>B:if one or more tanks are full<br>C:when transferring cargo<br>D:only when the barge is being towed

Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.
A:only when fully loaded
B:if one or more tanks are full
C:when transferring cargo
D:only when the barge is being towed

出自：海船船员证

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